Improvement in hot-air furnaces



J. ALBEE.

Hot Air Furnace.

No. 68,589. v Patentd Sept. 10, 1867.

N Firms; PholvLhhcgnphlt. Wanhlngton. c. c.

UNIT D STATEs PATENT OEEIcE.

'JAMES ALBEE, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 68,589, dated ScptemberlO, 1867.

To all whom it may concern:

Be it known that I, JAMES ALBEE, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Furnaces; and I do hereby declare the following to be a full and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

The nature of my invention consists, first, in the peculiar construction that I give to my furnace, so that when set up the corrugations in the outside walls form with the segments of the linings descending flues; second, in so constructing a sub-flue that the draft through the descending flues that enterinto it shall be equalized; third, in the arrangement for admitting air into the combustion chamber for the purpose of igniting the gases.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction.

Figure 1 is a perspective "iew of my improved furnace, the brick-work being omitted. Fig. 2 is a vertical'section through the center on the line X Y, Fig. 4., looking toward the Fig. 6. This chamber rests upon aplate, O,

. Figs. 2 and 3, which plate serves to form a base for it and the linings, and is in the same plane as the grate.

The plate N, Figs. 2 and 5, forms the bottom of the ash-pit, and is connected' to the plate 0 by means of the vertical walls of the ash-pit, as represented in Figs. 1 and 2, and

by the pipes B B B, &c.

The casting A, Figs. 1, 2, and 4, forms a subflue under the ash-pit, into which all the descending-flues enter, and from which the products of combustion are drawn off through the draft-pipe b.

H, Figs. 1, 2, and 7, represents the ash-pi doors H, Figs. 1 and 2, represents a small door opening into the sub-flue. This door may be held partly or entirely open by means ofa toggle or dog, 70, Figs. 1 and 7. The object of this dooris to regulate the draft by admitting more or less air directly to the draft-pipe B, thus checkingthe tendency of the air to force itselfinto the combustion-chamber. P, Figs. 1 and 2, represents the fuel-door.

L, Figs.1 and 2, represents a small pipe which conducts air to an air-receptacle, B, Fig. 2. This air-receptacle is on a level with the top of the lining of the fire-pot, and has small perforations m m, Fig. 2, through which air can enter and unite with the gases to insure their complete combustion.

The upper parts of the descending flues O B O B O B, 850., are formed by placing the lining against the inner projections of the corrugations of the fire-chamber, as shown in Figs. 1 and 6, so that the ascending currents from the fire can follow the direction of the arrows c c, Fig. 2, and thus pass down the corrugations, and inbaek of the lining of the fire-pot into the flues B B, 850., and from thence into the sub-flue A, Fig.4. The subflue A has two inwardly-projecting wings, a. a, as shown in Fig. 4, the object'of which is to direct the heated products of combustion to the center of the flue, so that the lines of draft indicated by the dotted lines, Fig. 4:, shall all be nearly equal, thus securing an even distribution of the heat over all the radiating parts of the furnace.

By forming the separate draft-fines by the corrugations of the casings and-the linings, as shown, I get an even distribution of heat over all parts of the furnace, and also force the heated products of combustion against the external parts of the furnace.

By adopting the corrugated form for my fur'nace body, I add greatly to the heatingsurface exposed, and thus enhance the heatingpower of the furnace.

Having thus described my invention, I will now proceed to set forth my claim.

What I claim as my invention, and desire to secure by Letters Patent of the United States, is

Arranging the lining or fire-pot in relation to the corrugations of the casing in such a manner that the descending draft fluesO G O", 830., are formed substantially in the manner and for the purpose set forth.

JAMES ALBEE.

Witnesses:

A. HUN BERRY, FRANK G. PARKER. 

